The quantum discord is defined as the mismatch of two different quantum
analogues of classically equivalent expressions of the mutual information and
may be used to quantify quantum correlations in mixed separable states. For a
two-mode squeezed thermal state with CM as in Eq. (REF ), the quantum
discord may be written as [1]}
\(D= & h(\sqrt{I_{2}})-h(d_{-})-h(d_{+})\nonumber \\& +h\left( \frac{\sqrt{I_{1}}+2\sqrt{I_{1}I_{2}}+2I_{3}}{1+2\sqrt{I_{2}}}\right)\) 
